Glossary term: 環形山
Description: 環形山是固體行星、月球或其他太空小天體表面的圓形凹陷。有些環形山是火山形成的，尤其是在地球和金星上，但大多數環形山是撞擊坑，是由大型太空岩石或彗核撞擊造成的。地球表面有幾十個撞擊坑，月球上有幾千個。月球上巨大的、顏色較深的圓形地貌 “瑪麗亞"就是巨大的撞擊坑，形成於數十億年前，然後被熔岩填滿，之後凝固。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
This is an automated transliteration of the simplified Chinese translation of this term
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
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